题目内容
计算.(能简算的要用简便方法计算.)
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96×
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(
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分析:(1)(2)(4)按照从左到右的顺序计算;
(3)(5)(11)运用乘法分配律简算;
(6)(9)先把除法变成乘法,再运用乘法分配律简算;
(7)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(8)运用加法交换律和加法结合律简算;
(10)先去括号,再根据加法结合律简算和减法的性质简算.
(3)(5)(11)运用乘法分配律简算;
(6)(9)先把除法变成乘法,再运用乘法分配律简算;
(7)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(8)运用加法交换律和加法结合律简算;
(10)先去括号,再根据加法结合律简算和减法的性质简算.
解答:解:(1)
×
×
,
=
×
,
=
;
(2)
÷
÷
,
=
×
,
=
;
(3)
×(
+7),
=
×
+7×
,
=
+
,
=
;
(4)
×
÷
,
=
×
,
=
;
(5)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(6)96×
-36÷
+
×40,
=96×
-36×
+
×40,
=(96-36+40)×
,
=100×
,
=80;
(7)
÷[(
-
)×2],
=
÷[
×2],
=
÷
,
=1;
(8)
+
+
-
,
=(
+
)+(
-
),
=1+
,
=1
;
(9)
×
÷
×
,
=
×
×
×
,
=(
×
)×(
×
),
=1×
,
=
;
(10)(
-
)-(
-
),
=
-
-
+
,
=(
+
)-(
+
),
=
-1,
=
;
(11)
×0.25+
×
,
=
×(0.25+
),
=
×1,
=
.
5 |
12 |
7 |
25 |
3 |
14 |
=
7 |
60 |
3 |
14 |
=
1 |
40 |
(2)
7 |
9 |
1 |
2 |
35 |
36 |
=
14 |
9 |
36 |
35 |
=
8 |
5 |
(3)
1 |
14 |
7 |
8 |
=
1 |
14 |
7 |
8 |
1 |
14 |
=
1 |
16 |
1 |
2 |
=
9 |
16 |
(4)
3 |
5 |
8 |
9 |
5 |
8 |
=
8 |
15 |
8 |
5 |
=
64 |
75 |
(5)
5 |
6 |
1 |
4 |
5 |
6 |
3 |
4 |
=
5 |
6 |
1 |
4 |
3 |
4 |
=
5 |
6 |
=
5 |
6 |
(6)96×
4 |
5 |
5 |
4 |
4 |
5 |
=96×
4 |
5 |
4 |
5 |
4 |
5 |
=(96-36+40)×
4 |
5 |
=100×
4 |
5 |
=80;
(7)
4 |
9 |
1 |
3 |
1 |
9 |
=
4 |
9 |
2 |
9 |
=
4 |
9 |
4 |
9 |
=1;
(8)
3 |
4 |
7 |
9 |
1 |
4 |
4 |
9 |
=(
3 |
4 |
1 |
4 |
7 |
9 |
4 |
9 |
=1+
1 |
3 |
=1
1 |
3 |
(9)
2 |
7 |
5 |
9 |
2 |
7 |
5 |
9 |
=
2 |
7 |
5 |
9 |
7 |
2 |
5 |
9 |
=(
2 |
7 |
7 |
2 |
5 |
9 |
5 |
9 |
=1×
25 |
81 |
=
25 |
81 |
(10)(
11 |
12 |
3 |
7 |
4 |
7 |
7 |
12 |
=
11 |
12 |
3 |
7 |
4 |
7 |
7 |
12 |
=(
11 |
12 |
7 |
12 |
3 |
7 |
4 |
7 |
=
3 |
2 |
=
1 |
2 |
(11)
3 |
5 |
3 |
5 |
3 |
4 |
=
3 |
5 |
3 |
4 |
=
3 |
5 |
=
3 |
5 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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